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Patented Dec. 15, 1925.

UNITED STATES PATENT OFFICE.

JOSEPH SEYER, OF E-IAVITHORNE, NEW JERSEY, ASSIGNOR TO STANDARD SILK DYE- ING 10., A CORPORATION OF NEW JERSEY.

PROCESS OF DYEING SILK.

No Drawing.

T0 aZZ whom it may concern Be it known that I, dosnri-i SEYER, a citi- Zen of the United States, a resident of Hawthorne, in the county of Passaic and State of New Jersey, have invented a certain new and useful Process of Dyeing Silk, of which the following is a specification.

This invention relates to a process of dyeing silk, and more particularly to a process of dyeing weighted silk with a direct dye.

It is an object of this invention to dye silk of arious kinds by avoiding the use of acid liquids, which have an injurious etlect upon certain forms of silk such as tin weighted silks. It is a further object oi the invention to dye silk of various kinds in various shades and colors by the use of direct dyes in non-acid media or dye liquors. Further objects of the invention will appear hereinafter.

In the preferred embodiment of the in vention the following irocess is employed:

Silk is tin weighted in the usual manner, while in the form of skeins or threads, and it is then treated in a weak alkaline bath with a direct dye to produce any desired color or shade thereof. For the bath material (ll-sodium hydrogen phosphate is dissolved in water in the proportion of 5 lbs. l ln-. ll in 250 gallons of water. The solution is tree of acids.

Silk, either in the form of a skein or piece goods, is dyed in the above described liquor with the aid of a direct dye. The process applied with great advant in the case of silks that have been previous. weighted, either in the form Oil a skein or in the form of piece goods. The absence of acid in the liquid prevents injurious action in connection with the tin salt, and the grcseiice ol' the di-sodiuni hydrogen phosphate facilita 'es the production of an even color.

Tie process can be economically carried out and without risk of seriously injuring the goods. The operation is simple and is of general application. The process may Serial No. 625,257.

also be carried out in connection with the process described in the Cole Patent, l,-l+l6,83%, in which is described a process of weighting silk before throwing it, or before weaving it. Thus the dyeing step which constitutes the final step, in one embodiment of the Cole process, may be carried out as above described with the aid of a direct dye.

its many apparently widely different embodiments of this invention may be made without departing from the spirit thereof, it is to be understood that I do not limit myself to the preferred embodiments described cxcept as indicated in the following claims.

I claim:

l. The process of dyeing silk piece goods comprising treating them with a weak alkaline solution containing a direct dye.

The process oi i'lycing weighted silk piece goods comprising treating them with a weak alkaline solution containing a direct dye. i

3. The process of dyeing silk piece goods weighted in the skein comprising treating them with a weak alkaline solution containing a direct dye.

ii. The process of dyeing silk piece goods weighted in the skein comprising treating them with a (ii-sodium hydrogen phosphate solution containing a direct dye.

5. The process of dyeing silk piece goods weighted with a tin compound which comprises treating them with di-sodium phosphate solution containing a direct dye.

(i. The process of dyeing silk piece goods weighted in the skcin with a tin compound, which comprises treating them with disodium phosphate solution containing a direct dye. i

In testimony that I claim the foregoing, l have hereunto set my hand this -l-tth day of ivlarch, 1.923. t

JOSEPH 91 ii PER. 

